When to use "Ok noted"?

I'm a software developer. My situation is, I'm working with my customer (onshore project manager) via chatting using Skype. He helps me to make his side's server available and give me a link to the test page so that I can test the page. After he send me the link. I reply:

OK.
I will test it now.

But my boss (solution architect) immediate talk to me (via Skype too)

You should say "Ok noted"

Could anybody please explain when to use "Ok noted"?
What are differences between "Ok" and "Ok noted"?

Sorry for my English. Thank a lot!

"OK Noted" would be considered a pointless affectation in many environments. It doesn't necessarily add any information, and in most IT environments, your response would give exactly the right amount of information.

That said, he is your boss, so depending on your particular goals and aims, and his personality, you may just wish to go with "OK Noted" anyway.

I hear "OK Noted" in meetings all the time. It has two very subtle meanings.

#1 - We got what you are saying, let's move on. (way to shut someone up)

#2 - Jotted that down for meeting notes. Meaning they said the phrase to communicate to you that they took a note on your idea/conversation/task. If there is a possible action item for the "OK Noted" conversation you can be sure to see it in an email soon.